# Posts by david

Total # Posts: 2,325

**Physics**

A man holds a child on his shoulder while watching a football match.how much work is done if the game lasts for 2hours

**mathematics**

Thanks a lot.

**mathematics**

a town has a population of 8400 in 1990. Fifteen years later, it's population had grown to 12 500. Assuming that the population continues to grow at the same exponential rate, when will the population reach 20 000? Please help im trying to answer this question for past 2 ...

**science;chem**

The hydrolysis of ethyl acetate (CH3COOC2H5) by sodium hydroxide yields ethanol (C2H5OH) and sodium acetate (NaO2CCH3) by the reaction shown, which follows second order kinetics. In an experiment 500 mL of 0.1 M ethylacetate in water is mixed with 500 mL of 0.1 M NaOH in water...

**physics**

What is the final answer going to be and where did you get that t is 2.05 seconds

**physics**

On planet Seeturn, the free fall acceleration is 9.800 N/kg but there is also a strong downward electric field that is uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 micro C (5.00*10-6) is thrown upward at a speed of 20.1 m/s, and it hits the...

**MATH!!!**

Sorry it was supposed to be Determine a+b+c 25/84=1/a+1/ab+1/abc

**MATH!!!**

I tried to multiply the equation by a then b then c... I don't know please help by showing the steps I am very lost Determine a+b+c 25/84=1/a+1/an+1/abc

**math gr 10**

no those were the choices my maths teacher gave us

**math gr 10**

Jordan invests $100 and doubles her money in 8 years. Which operation illiterates the correct use of the rule 72 to estimate the annual interest rate 72x8 8+72x8 72/100 100/8 I put 8+72x8 is that right??

**gr 10 math**

in a survey 144 people, 83 people said they liked eggs, 65 people said they liked toast, 30 said they liked neither. how many people like both? a 34 b 71 c 18 d 114

**math**

I got 2582.05 idk what that is in years

**math**

what is 5900 is years? thank

**physics**

A circle has 360 degrees how can it be 720 degrees.

**Maths**

A student spent 2 /9 of his pocket money on beverage and 1 /4 on books. What? fraction

**Chemistry**

If one 5 mL dose of Milk of Magnesia contains 400 mg of magnesium hydroxide, calculate the concentration of magnesium hydroxide in mol/L.

**Math**

h=10-x v of object = v of cylinder v of hemisphere then u are good to go

**math**

Write the equation of the line that has the following: Contains point (5,3) and is parallel to y = 6x – 5 ------------------------- ---------------------------- The slope is 6 and the y intercept is 27 right?

**math**

Write the equation of the line that has the following Contains point (3,6) and is perpendicular to y = 2x + 4 --------------------------------------------------- I got that the slope was -1/2 but is the y-intercept really 15/2? can you even have this as a y intercept?

**Physics**

Bob has a helicopter and from the launch pad he flies the following path. First he travels from the launch pad a distance of 52 kilometers at heading 79 degrees South of West. Then he flies 26 kilometers heading 22 degrees north of East. After this he flies 47 kilometers ...

**dbs**

Determine the rate of interest at which a sum of money will become 216/125 times the original amount in 1 and a half years, if the interest in compounded half

**History**

What are the “Rentier States” and why do the oil-producing countries in the Middle East qualify as rentier states?

**Mathematics**

The height in metres of the water in a harbour is given approximately by the formula d=6+3cos30t, where t is the time in hours from. Find a) The height if the water at 9:45pm b) The highest and the lowest water level and occur

**Math **

I have 20 tens. I have 3 times as many ones that I have tens. What number am I?

**MATH**

HOW MUCH PETROL IS NEEDED TO TRAVEL88 KM

**chemistry **

what are the electrolytes in ORS?

**Angular motion**

a car has wheel of radius 0.3m and is traveling at a speed of 36m\s. calculate the angular speed of the wheel

**SCHM012**

diagram all possible pathways for deexciting from n=4 to n=1

**math**

Team Alpha had one fourth as many people as team Beta. After 6 people quit team Beta and 12 people were transferred to team Alpha from team Beta, both teams became equal. How many people were there originally on team Alpha?

**math**

Team one had twice as many workers as team two. The number of workers in team one is reduced by 5 and the number of workers in team two is reduced by 2. How many workers are there in each team now if there are 7 more workers in team one?

**math**

Three departments of a company employ a total of 1274 people. The second department employs 70 more people than the first one, and the third department employs 84 more workers than the second one. How many people work in each department?

**math**

Kate used 555 grams of wool to knit a sweater, a hat and a scarf. She used 5 times less grams for the hat than for the sweater. She used 5 grams more for the hat than for the scarf. How many grams of wool did she use to knit each item?

**math**

The lengths of the sides of a rectangle are in a ratio of 4:7. If the length is 31.5 in., find the width, perimeter and area of this rectangle.

**Maths**

The ages of a woman and her daughter add to 45, five years ago, the woman is six times her daughters age. How old was the woman when her daughter was born?

**calculus**

Find the constant a such that the function is continuous on the entire real line g(x)=x^2-a^2/x-a if x doesn't equal a 6 if x=a

**Chemistry**

What is the percent yield of a reaction that converts 5,0 kg of toluene to 6,02 kg of benzoic acid? 2C6H5CH3 + 3O2 --> 2C6H5CO2H + 2H2O

**Maths**

A tub is filled in 20mins but there is a leakage in it which can empty the full tub in 1hr in how many minutes can it be refilled

**Science**

Can you send me to a link that explains how genetic variation and environmental pressures can lead to a change in the characteristics of a population.

**MATHS**

There are 2000 students in a course. They wrote a mathematics test which was scored out of 40 and then converted to percentage. 1. Draw a flowchart that reads the name, sex and score of each student, and outputs the names of the female students that scored below 45% and how ...

**math**

Two circles touch each other. One of the circles has a diameter of 26 cm and the other circle has a diameter of 12 cm. Write down (a) the least distance between the centres of the two circles, ....................................................... cm (b) the greatest distance...

**Social studies**

Why do you think the Canadian government is opposed to Quebec's becoming a separate nation? I don't want someone to tell me can you provide me with a source so I can find the answer

**Social studies**

Thanks you for your time.

**Social studies**

My second answer is cod fishing.

**Social studies**

@Reed Also I meant in canada

**Social studies**

Which of the following is no longer allowed in the Atlantic Provinces? A)cod fishing B)fishing C)aquaculture**** D)fish processing Correct?

**Math**

Four pencils cost $0.60. How many pencils can you buy for $0.45?

**Math**

If my ladder is 6m long and its foot is 1.5m from a vertical wall how far can the ladder reach up the wall?

**History**

need help on history question The Gulf of Tonkin incident opened the door to A) Kennedy's assassination B) the Rolling Thunder strategy C) Lyndon Johnson realizing that the military D) could not win the war E) all of these answers are correct

**thermochemistry**

For part A i calculated Q to be 99.1608 kJ/mol. I don't understand where to go from there though to find part b.

**thermochemistry**

. Mountain climbers often brew tea by melting snow, which they heats over a stove. Our stove burns butane (C4H10), which has a heat of combustion of -2878 kJ/mol. The temperature of the snow is initially at -20 °C, and we need 80 °C water to brew tea. a. How much heat ...

**math**

the daily production of two factories A and B are 300 and 200 bottle respectively .2% of the product o f each factory are found to be defective .if 6 defective bottle are randomly selected from a daily production of A and B .find the probability that 4 of the defective bottles...

**chemistry**

Tfinal= m1c1T1 + m2c2T2/(m1c1+m2c2) I found this equation to solve for Tfinal, but not sure how it was derived or if its the correct method to solve this problem

**chemistry**

A 3.04 g piece of aluminum at 60.0 °C is placed into a “styrofoam cup” calorimeter filled with 150.0 mL of water at 25.0 °C. What is the final temperature of the contents of the calorimeter once thermal equilibrium has been established (everything has the ...

**English**

I was in a camp when i came back from the camp someone said "good exposure though what shoul i say ??

**English**

It about publicity

**English**

I was in a camp when i came back someone said these

**Algebra 1**

Consider the function L = 4h where L equals the number of legs on h horses. What would be the domain and range of the function?

**Math**

Talor is building a birdhouse for his backyard. He needs a piece fo wood that is 8 inches long and 6 inches wide. What is the area of the piece of wood tayler needs

**Math**

Byron’s house has a roof with dimensions shown. (Roof: 1m Height, 7m Hypotenuses, 12m length) He knows that the average rainfall in his suburb is 30cm per year. Byron would like to install a cylindrical rainwater tank to hold the water that runs off the roof. The tank is ...

**Biology**

What is one of the outputs or products of respiration? It has to be a four letter word with the second letter being e because it is the hint that my teacher gave us. I couldn't find anything on it. So far I have disocovered is carbon dioxide, water, and atp.

**Philosophy**

This is what i have done a. New Guinea is not advanced. This is Vagueness We do not know what New Guinea is not advanced in b. I called him a liar. It is true, and I am sorry for it. (Statement is that of a politician responding to the demand that he apologizes for calling a ...

**Philosophy**

1. For each of the following underlined statements identify any vagueness, semantic ambiguity or syntactic ambiguity in the statement. If the statement is vague, explain why. If the statement is ambiguous, provide at least two alternative interpretations of the statement that ...

**Social studies**

1. Why is mining important to the economy of the United States? Can you link a website where I can find this information more quicker?

**floral**

September

**Math**

theoretically if you roll a number cube 36 times, how many times would you expect to roll the number one? could you also give me explanation? Thank you. and also answer as fast as possible.

**Chemistry**

In the analysis of a sample of drinking water, a rate of 25.00 mL of the water requires 16.04 mL of AgNO3 to 0.05647 M in order to achieve an end to the Mohr method. What is the concentration of chloride ions in the sample?

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Algebra 1**

You have decided to get a job to pay for a car to drive. You estimate it will cost you $300 per month to buy and maintain the car. You get a job that pays $9.10 per hour. Write an equation for your pay as a function of the hours worked (Use x for the hours and y for the pay). ...

**Science **

1. In paper chromatography, is the substance being tested the solute or solvent? Explain your answer. I think the substance being tested is a solvent. I think this because it is being dissolved to form the ink on the filter paper. 2. A bucket of paint spills on ...

**Chemistry**

The volume of 10 ml of H2SO4 solution was diluted 250 ml with distilled water. This resulting solution, 25 ml were neutralized by 10 ml of 0.1 mol/L solution of NaOH. calculate the Molarity of sulfuric acid.

**Calculus**

The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph it looked very ...

**Physics **

Water of mass 200g and temperature 10digrees Celsius is put in a copper calorimeter of mass 80g. Steam from boiler at a normal pressure is passed into the calorimeter for sometime. The total mass of the calorimeter and contents is 283g. The final temperature of the contents is...

**Physics**

A balloon is filled with a gas which is lighter than air. It is observed to rise in air up to a certain height. State the reason why the balloon stops rising.

**Math**

Students are being surveyed about the weight of books and supplies they are carrying as they attend class. a. Identify the variable of interest. b. Identify the type of variable. c. List a few values that might occur in a sample

**math**

76.9cm

**Reply**

True, I needed help one time and god forbid they kicked me for a while because I asked for help. They are kicking people because they can.

**Math**

Find the equation of the line that has the same slope as the line through points (0,4) and (-5,7). But goes through point (-6,4) I don't get how to find the equation of the line

**american government**

what are the similarities between baltimore county council and the maryland

**english**

I think that the correct variant will be D a chronological order. One of the primary ways you might use it to write a historical narrative about the subject of term paper. For example, you might review the history of labour unions before you discuss the current situation.

**English writting**

I do not quite understand the topic. You may write about Barbie’s negative effects on young girls and there is much material about it. Even if your essay is ready, you may turn to the writers and let them proofread your work. Please, check out Marvelous essay service

**Science**

In what acceleration will tear a rope if it raises vertically body mass of 500 kg? The rope bears maximal strength force 15 kN.

**Science**

Determine the weight of an astronaut with a weight of 100 kg, if the rocket which rises him moves with acceleration 9,8 m/s^2

**mathsssss**

Suppose the roots of 2x^2 + 10x + 1 are a and B. Suppose another quadratic, x^2 + 1x + r, has roots y = a + 1/B and ? = B + 1/a. What are q and r?

**physics **

a truck of mass 5000kg is used to tow a jeep of mass 2500kg, the truck moves with a speed of 3.0ms(power -1) just before the towing rope becomes taut,calculate the speed of the truck just before the towing rope became taut,loss of kinetic energy of the system just after the ...

**physics **

a body British moving with a velocity of 20ms(power -1) collides with another body A, moving in the same direction on the same horizontal line with a velocity of 10ms (power -1).if the mass of the body A is three times the mass of body B, and the collision is perfectly elastic...

**physics **

a uniform meter bar of mass 120kg is sup ported on two knife edges 30cm from its center, with a diagram calculate the reactions at these supports when a 160kg mass is suspended 20cm from the center of gravity of the bar towards the left end

**physics**

A 200.0N steel box resting on a smooth surface is pushed to the right by a force of 50N, if the coefficients of starting and sliding friction are 0.74 and 0.53 respectively will the box move and if so what force isrequired to keep it moving at constant speed?

**physics**

A car traveling at 100 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.85 m . What was the magnitude of the average acceleration of the driver during the collision? Express the answer in terms of "g's," ...

**Research**

Research is a systematic inquiry that investigates hypotheses, suggests new interpretations of data or texts, and poses new questions for future research to explore. And statistics will be not enough to have a full research.

**Math**

10.8

**Rates**

Not everyone helps everyone, which is a bit annoying...

**Algebra**

i'm not sure, but i know that b is definetly not the answer.

**Precalculus**

dats hard aff dude

**Language Arts**

Here are for your the similarities: Both follow much of the mythological journey covered by Joseph Campbell's breakdown Both have the mythical "supernatural aid" in the likes of Obi-Wan Kenobi and Gandalf, both of which wear robes and hoods. Both have the ...

**Physics**

How fast does a bowling ball drop 4 miles above ground.

**Maths**

Compute the following polynomial in standard form: (1 + x + x^2 + . . . + x^16)(1 - x)

**Science**

28cm3 of a gas weighs 0.4g at STP.Calculate the molecular mass of the gas.

**CHECK MY CHEMISTRY WORK PLEASE ASAP**

1. You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium hydroxide (NaOH) ...

**CHEMISTRY**

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l. 2. You have a sample which consists of 428g sodium hydroxide (NaOH) ...